Chemical and sensory analysis of off-flavour compounds in drinking water
1986 (English)Doctoral thesis, comprehensive summary (Other academic)
A combination of chemical and sensory methods, which permit the analysis of individual off flavour organic compounds in drinking water, has been developed. A modified stripping technique using an open system was found to be superior to the standard closed-loop system. The open stripping system permits significantly higher stripping temperatures which was shown to be very important for an efficient enrichment of off-flavour compounds. Furthermore, the open system gives a lower blank level. It has also been shown that for many compounds the extraction of the carbon filters is improved when a suitable solvent mixture is used.
Sensory evaluation of the gas chromatographic effluent, so-called column sniffing, has proven to be a powerful technique for finding the. odorous compounds in the complex chromatograms obtained from the stripping extracts. A simple sniffing device, which permits a very sensitive analysis of odorous compounds with highly accurate retention times, has been developed.
The investigations of the sources of off-flavours in drinking water derived from surface water have shown the importance of naturally produced substances. In fact, the results indicate that all off-flavour compounds detected in the drinking water examined in the studies are of biologicalorigin. The investigations of water treatment methods have clearly shown that artificial groundwater recharge in sand and gravel ridges ( eskers) is much superior to conventional surface water treatment (using coagulation/sand filtration) in removing compounds with earthy, muddy or musty odours,
Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 1986. , 48 p.
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 3
Social Sciences Interdisciplinary
IdentifiersURN: urn:nbn:se:liu:diva-34943Local ID: 24231ISBN: 91-7372-969-8OAI: oai:DiVA.org:liu-34943DiVA: diva2:255791
1986-02-28, Sal C 3, Hus C, Universitetsområdet Valla, Linköping, 10:15 (Swedish)
Papers, included in the Ph.D. thesis, are not registered and included in the posts from 1999 and backwards.2009-10-102009-10-102012-07-13Bibliographically approved